I could be wrong, but I think the monstrosity is using normal living creature and not construct messaging (constructs do not typically have hearts and blood).

< You claw your claws at a mud-infused monstrosity. A mud-infused monstrosity attempts to dodge. The claws lands a light hit that collapses the ribcage and bursts the diaphragm in a messy splattering of bloody pink froth.
A mud-infused monstrosity groans softly and stumbles a bit, then waves its arms as it topples backwards! Hairline cracks form all over its body, each of which starts threatening to get wider. Despite these, the monstrosity threatens to get back up again, groaning and straining.

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Never attribute to malice that which is adequately explained by stupidity.